It's hard to break Black's position, but White can try for a long time without much risk (although in a blitz game there is always some risk). The plan is to push f2-f4 at the right moment.
14... d6c5 The plan is to take on d5 and defend a passive position without pawn weaknesses. 15. a1d1  15... e6d5  16. c4d5  16... e7d6 